harbison



(No Model.)

J. P. HARRISON.

EQUILIBRATBD GAS HOLDER.

Patented Feb. 13, 1883.

u PETERS. Halo-Lithograph, Washinghm n. c.

. UNITED STATES PATENT OFFICE.

JOHN F. HARRISON, OF NEW/V YORK, Y., ASSIGNOR OF ONE-HALF TO HENRY J. DAVISON, OF SAME PLACE.

EQUILIBRATED GAS-HOLDER.

SPECIFICATION forming part of- LettersPatent N 0. 272,248, dated February 13, 1883. Application filed November 4, 1882. (No model.)

To all whom it may concern:

Be it known that I, JOHN F. HARRISON, of the city, county, and State of NewYork, have invented a new and useful Improvement in Equilibrated Gas-Holders,of which the following is a. full, true, and exact description, reference being had to the accompanying drawings.

In the ordinary construction of gas-holders it has been found to be practically impossible to maintain a uniform pressure upon the gas in the different positions of the holder, owing to thefact that the inner and outer sections of the holder do not permanently engage with each other, and that when the inner section is free there is less pressure upon the gas than when the two sections are connected together and the combined weight of them bears upon.

the gas. An attempt has been made to remedy this difficulty by more or less counterbalancing the weight ofthe exterior section of the holder; but this remedy is insuflioientfor the difliculty, since the exterio'r section must necessarily be heavier than the counter-balance.

I have devised a method wherein by a simple arrangement the; interior section of the holder is in its resulting pressure upon the gas at first made heavier than its own weight, and after it has arisen to its full upward movementthis additional weight is taken off and an upward or counterbalancing spring put upon the outer section of the holder, thereby in eli'ect decreasing its weight. These results areaccomplished by one counter-balance and chain at each point of suspension, and in their result practically increase, during the operation of the machine, the weight of the inner section and decrease the weight of the outer section of the holder.

My invention will be readily understood from the accompanying drawings, in which similar letters refer to similar parts.

Figure 1 represents a sectional view of both sections of the holder depressed; Fig. 2, avlew of the holder with the inner section raised; Fig. 3, a sectional view of theholder with both sections raised Fig. 4, a detailed view of my pulley'and chain arrangement; Fig. 5, a plan view of one of my pulleys, showing also the pulleys in position.

. A represents the inner section, B the outer other by suitable guide-rolls, D, in the usual Double chains are attached to the u manner. brackets M, supporting the guide-roll D on the upper holder. These chains pass downward and around the rollers E, fastened to the outer section of the holder, and thence upward to the link N, where they are united in one chain, passing over the rollers H on top of the pulley J. To the other end of this chain the adjustable weight G is attached.

The operation of my apparatus can now be readily understood. Supposing gas to be admitted to the holderwhenintheposition shown in Fig. 1, theinner section will commence to rise, and will continue to rise until its sealing-cup engages with the correspondinglipon the outer section, B, of the holder, when it will bein the position shown in Fig. 2. As the inner holder rises from the position shown in Fig. l to that in Fig. 2, it will thereby elevate the weight, as shown in the figures, and the weight G is thereby added to the weight of the inner sec tion, A, of the holder. however, when the two sections rise together, the weight G will once more fall, and as the combined sections move from the position shown in Fig. 2 to the position shown in Fig.

After engagement,

apportioning these weights andjudiciously disand decreasing the weight of the two com- 3. The combination of the inner holder-secbined sections in their eii'ect upon the gas, subtion, A, outer section, B, chain 0, pulley H, to stantially as described. Weight G, pulley E, and bracket M, or its 2. The combination, in a gas-holder, of the equivalent, substantially as described. 5 inner section, A, the outer section. B, and the JOHN F. HARRISON.

double chain or cord (1, passing" under the pull v leys E and attach ed to bracket M, or its equivalent, substantially as described,

Witnesses:

(3120. H. EVANS, WM. A. PQLLOOK. 

